Green metal composite material

ABSTRACT

The invention provides a green metal composite material, which is prepared by the following method: Provide Mg, Mo, Al, Ni, and Ti powders; weigh the Mg, Mo, Al, Ni, and Ti powders; and perform the first ball milling on the Mg, Mo, Al, Ni, and Ti powders; perform vacuum melting to obtain a Mg-based alloy ingots; crush the Mg-based alloy ingots; provide carbon nano tubes and graphene powders; and perform surface modification; mix well the crushed Mg-based alloy ingots and the surface modified carbon nano tubes and the graphene powders, and perform a second ball milling to obtain a second mixed powder; then perform a first heat treatment to obtain a third mixed powder, then perform a second hot pressed sintering. The process technology of this invention solves the problems of poor compatibility, easy to be segregated and unstable property of the non-metallic particles and metallic matrix.

TECHNICAL FIELD

The present invention relates to the technical field of new energy materials, especially a green metal composite material.

BACKGROUND TECHNOLOGY

The research on carbon series hydrogen storage materials is a hot topic in recent years. It is known that carbon has a large or small adsorption to almost all gases due to its porous structure and the special attraction of carbon atoms to gas molecules, so it is natural to study it as a hydrogen storage material. At present, the research on carbon series hydrogen storage materials mainly focuses on graphite, activated carbon, carbon nano tubes and carbon nanofibres. The following will make a brief introduction to the research of these materials, especially the research of carbon nanotubes and carbon nanofibers. The adsorption capacity of activated carbon to H2 is not obvious, and adsorbing capacity is also relatively low, form about 3 to 6 wt %, and the processing conditions are rigorous, and the temperature is 78 K, and the pressure is 40 bars. However, activated carbon is inexpensive and readily available. If appropriate methods can be used to improve its performance, there will be great application prospects. In the existing technologies, activated carbon is treated with nitric acid or NaOCl, and its hydrogen absorption capacity and discharge as electrodes are significantly improved. Carbon nanotubes and carbon nanofibers are popular hydrogen storage materials because of their large hydrogen storage capacity, which generally reaches 10 wt % and some even reach 60 wt % or more. However, some scientists have previously tested this, but they ended in failure, while it is an indisputable fact that its hydrogen storage capacity is higher than that of the hydrogen storage alloy. In addition, its weight is relatively light and is easy to carry. However, because of its very difficult synthesis and rigorous synthesis conditions, and it will consumes a lot of energy for its synthesis. After synthesis, chemical treatment and purification should also be performed before application. Most importantly, its hydrogen storage property and hydrogen storage mechanism are still in disputes, so it has not been widely used.

The information disclosed in this background technology section is only intended to provide an understanding of the general background of this invention, and should not be construed as acknowledging or implying in any way that the information composition is the existing technology known to the general technical personnel in the field.

SUMMARY OF THE INVENTION

The purpose of the invention is to provide a green metal composite material, overcoming the shortcomings of existing technologies.

To achieve the purposes mentioned above, the invention provides a green metal composite material, characterized in that: this green metal composite material is prepared by the following method: provide Mg, Mo, Al, Ni, and Ti powders; weigh the Mg, Mo, Al, Ni, and Ti powders according to a predetermined chemical formula; and perform the first ball milling on the Mg, Mo, Al, Ni, and Ti powders after weighing to obtain a first mixed powder; perform vacuum melting on the first mixed powder to obtain a Mg-based alloy ingots; crush the Mg-based alloy ingots; provide carbon nano tubes and graphene powders; and perform surface modification on the carbon nano tubes and graphene powders; mix well the crushed Mg-based alloy ingots and the surface modified carbon nano tubes and the graphene powders, and perform a second ball milling on the mixture to obtain a second mixed powder; then perform a first heat treatment on the second mixed powder to obtain a third mixed powder; then perform a second hot pressed sintering on the third mixed powder.

Preferably, in the technical scheme mentioned above, the predetermined chemical formula is Mg100-x-y-z-aMoxAlyNizTia, wherein, x=0.5-1.5, y=2-3, z=10-12, a=1-3.

Preferably, in the technical scheme mentioned above, the first ball milling performed on the Mg, Mo, Al, Ni, and Ti powders after weighing is as follows: the ball milling speed is 1500-1800 r/min, the ball milling time is 10-20 h, the ratio of ball to material is 8:1-9:1, in the ball milling process, each ball milling lasts 60-70 min, and suspend the ball milling for 4-5 min, the temperature in the ball milling tank is controlled to be lower than 600° C. during the ball milling process.

Preferably, in the technical scheme mentioned above, specifically, the vacuum melting performed on the first mixed powder is as follows: the vacuum degree is less than 0.01 Pa, the smelting time is 80-100 min, and the alloy ingots are flipped once every 200-250 s during the smelting process.

Preferably, in the technical scheme mentioned above, specifically, the surface modification performed on the mentioned carbon nano tubes and graphene powders is as follows: prepare the silane coupling agent organic solvent, wherein the weight percentage of silane coupling agent is 2-3 wt %; place the carbon nano tubes and graphene powders into the organic solution of the silane coupling agent, and stir, the stirring time is 50-70 min, and the stirring temperature is 70-80° C.

Preferably, in the technical scheme mentioned above, specifically, the second ball milling is as follows: the ball milling atmosphere is argon atmosphere, the ball milling speed is 500-600 r/min, the ball milling time is 5-8 h, the ratio of ball to material is 4:1-5:1, in the ball milling process, each ball milling lasts 30-40 min, and suspend the ball milling for 4-5 min, the temperature in the ball milling tank is controlled to be lower than 300° C. during the ball milling process.

Preferably, in the technical scheme mentioned above, in the second mixture powder, Mg-based alloy ingots account for 100-120 parts by weight after being crushed, surface modified carbon nano tubes account for 10-20 parts, and surface modified graphene powders account for 3-5 parts.

Preferably, in the technical scheme mentioned above, the first heat treatment performed on the second mixed powder is as follows: the heat treatment atmosphere is hydrogen atmosphere, the heat treatment temperature is 600-650° C., the heat treatment time is 10-20 min, and the heating rate is 10-20° C./min.

Preferably, in the technical scheme mentioned above, the second hot pressed sintering performed on the third mixed powder is as follows: the hot pressing pressure is lower than 0.03 Pa, the hot pressing temperature is 700-780° C., the hot pressing pressure is 5-10 MPa, and the hot pressing time is 5-10 min.

Compared with existing technology, the present invention has the following beneficial advantages: the Mg-based hydrogen storage material is more stable in chemical properties than the complex hydride hydrogen storage material, and the Mg-based hydrogen storage material can adapt to a more severe operating environment, and has less material storage requirements, lower cost of storage.

Compared with the rare earth based hydrogen storage materials, the Mg-based hydrogen storage materials do not include important rare earth elements, and the raw materials are widely used and are not easily controlled by other countries.

However, at present, the biggest problem for Mg-based hydrogen storage materials is its poor hydrogen storage capacity. Meanwhile, the modification of Mg-based hydrogen storage materials by means of doping metal elements to improve its hydrogen storage capacity has actually reached the theoretical limit, and the hydrogen storage capacity cannot be further improved by simple composition design. In order to continue to improve the hydrogen storage capacity of materials, there are several feasible methods as follows: 1. it is expected to continue to improve the hydrogen storage capacity of materials by changing the preparation method of materials and controlling the microstructure of materials. However, due to the unclear relationship between the microstructure of materials and hydrogen storage capacity, this method is expensive to design and extremely difficult to implement after design. 2. doping non-metallic elements, but the properties of these alloy are unstable because of the compatibility between non-metallic elements and metallic elements. To overcome the shortcomings of existing technologies, the present invention provides a hydrogen storage material doped with carbon nano tubes and graphene powder. The process technology of this invention solves the problems of poor compatibility, easy to be segregated and unstable property of the non-metallic particles and metallic matrix, and can be used for preparing hydrogen storage materials with stable properties, strong hydrogen storage capacity and suitable for industrial production at a low cost.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The following implementations are provided in order to better illustrate this present invention, and to communicate the scope of the invention fully to the technical personnel in this field.

Implementation Example 1

The green metal composite material is prepared by the following method: provide Mg, Mo, Al, Ni, and Ti powders; weigh the Mg, Mo, Al, Ni, and Ti powders according to a predetermined chemical formula; and perform the first ball milling on the Mg, Mo, Al, Ni, and Ti powders after weighing to obtain a first mixed powder; perform vacuum melting on the first mixed powder to obtain a Mg-based alloy ingots; crush the Mg-based alloy ingots; provide carbon nano tubes and graphene powders; and perform surface modification on the carbon nano tubes and graphene powders; mix well the crushed Mg-based alloy ingots and the surface modified carbon nano tubes and the graphene powders, and perform a second ball milling on the mixture to obtain a second mixed powder; then perform a first heat treatment on the second mixed powder to obtain a third mixed powder; then perform a second hot pressed sintering on the third mixed powder. In this process, the predetermined chemical formula is Mg100-x-y-z-aMoxAlyNizTia, wherein, x=0.5, y=2, z=10, a=1. The first ball milling performed on the Mg, Mo, Al, Ni, and Ti powders after weighing is as follows: the milling atmosphere is argon atmosphere, the ball milling speed is 1500 r/min, the ball milling time is 10 h, the ratio of ball to material is 8:1, in the ball milling process, each ball milling lasts 60 min, and suspend the ball milling for 4 min, the temperature in the ball milling tank is controlled to be lower than 600° C. during the ball milling process. The vacuum melting performed on the first mixed powder is as follows: the vacuum degree is less than 0.01 Pa, the smelting time is 80 min, and the alloy ingots are flipped once every 200 s during the smelting process. The surface modification performed on the mentioned carbon nano tubes and graphene powders is as follows: prepare the silane coupling agent organic solvent, wherein the weight percentage of silane coupling agent is 2 wt %; place the carbon nano tubes and graphene powders into the organic solution of the silane coupling agent, and stir, the stirring time is 50 min, and the stirring temperature is 70° C. The second ball milling is as follows: the ball milling atmosphere is argon atmosphere, the ball milling speed is 500 r/min, the ball milling time is 5 h, the ratio of ball to material is 4:1, in the ball milling process, each ball milling lasts 30 min, and suspend the ball milling for 4 min, the temperature in the ball milling tank is controlled to be lower than 300° C. during the ball milling process. In the second mixture powder, Mg-based alloy ingots account for 100 parts by weight after being crushed, surface modified carbon nano tubes account for 10 parts, and surface modified graphene powders account for 3 parts. The first heat treatment performed on the second mixed powder is as follows: the heat treatment atmosphere is hydrogen atmosphere, the heat treatment temperature is 600° C., the heat treatment time is 10 min, and the heating rate is 10° C./min. The second hot pressed sintering performed on the third mixed powder is as follows: the hot pressing pressure is lower than 0.03 Pa, the hot pressing temperature is 700° C., the hot pressing pressure is 5 MPa, and the hot pressing time is 5 min.

Implementation Example 2

The green metal composite material is prepared by the following method: provide Mg, Mo, Al, Ni, and Ti powders; weigh the Mg, Mo, Al, Ni, and Ti powders according to a predetermined chemical formula; and perform the first ball milling on the Mg, Mo, Al, Ni, and Ti powders after weighing to obtain a first mixed powder; perform vacuum melting on the first mixed powder to obtain a Mg-based alloy ingots; crush the Mg-based alloy ingots; provide carbon nano tubes and graphene powders; and perform surface modification on the carbon nano tubes and graphene powders; mix well the crushed Mg-based alloy ingots and the surface modified carbon nano tubes and the graphene powders, and perform a second ball milling on the mixture to obtain a second mixed powder; then perform a first heat treatment on the second mixed powder to obtain a third mixed powder; then perform a second hot pressed sintering on the third mixed powder. In this process, the predetermined chemical formula is Mg100-x-y-z-aMoxAlyNizTia, wherein, x=1.5, y=3, z=12, a=3. The first ball milling performed on the Mg, Mo, Al, Ni, and Ti powders after weighing is as follows: the milling atmosphere is argon atmosphere, the ball milling speed is 1800 r/min, the ball milling time is 20 h, the ratio of ball to material is 9:1, in the ball milling process, each ball milling lasts 70 min, and suspend the ball milling for 5 min, the temperature in the ball milling tank is controlled to be lower than 600° C. during the ball milling process. The vacuum melting performed on the first mixed powder is as follows: the vacuum degree is less than 0.01 Pa, the smelting time is 100 min, and the alloy ingots are flipped once every 250 s during the smelting process. The surface modification performed on the mentioned carbon nano tubes and graphene powders is as follows: prepare the silane coupling agent organic solvent, wherein the weight percentage of silane coupling agent is 3 wt %; place the carbon nano tubes and graphene powders into the organic solution of the silane coupling agent, and stir, the stirring time is 70 min, and the stirring temperature is 80° C. The second ball milling is as follows: the ball milling atmosphere is argon atmosphere, the ball milling speed is 600 r/min, the ball milling time is 8 h, the ratio of ball to material is 5:1, in the ball milling process, each ball milling lasts 40 min, and suspend the ball milling for 5 min, the temperature in the ball milling tank is controlled to be lower than 300° C. during the ball milling process. In the second mixture powder, Mg-based alloy ingots account for 120 parts by weight after being crushed, surface modified carbon nano tubes account for 20 parts, and surface modified graphene powders account for 5 parts. The first heat treatment performed on the second mixed powder is as follows: the heat treatment atmosphere is hydrogen atmosphere, the heat treatment temperature is 650° C., the heat treatment time is 20 min, and the heating rate is 20° C./min. The second hot pressed sintering performed on the third mixed powder is as follows: the hot pressing pressure is lower than 0.03 Pa, the hot pressing temperature is 780° C., the hot pressing pressure is 10 MPa, and the hot pressing time is 10 min.

Implementation Example 3

The green metal composite material is prepared by the following method: provide Mg, Mo, Al, Ni, and Ti powders; weigh the Mg, Mo, Al, Ni, and Ti powders according to a predetermined chemical formula; and perform the first ball milling on the Mg, Mo, Al, Ni, and Ti powders after weighing to obtain a first mixed powder; perform vacuum melting on the first mixed powder to obtain a Mg-based alloy ingots; crush the Mg-based alloy ingots; provide carbon nano tubes and graphene powders; and perform surface modification on the carbon nano tubes and graphene powders; mix well the crushed Mg-based alloy ingots and the surface modified carbon nano tubes and the graphene powders, and perform a second ball milling on the mixture to obtain a second mixed powder; then perform a first heat treatment on the second mixed powder to obtain a third mixed powder; then perform a second hot pressed sintering on the third mixed powder. In this process, the predetermined chemical formula is Mg100-x-y-z-aMoxAlyNizTia, wherein, x=1, y=2.5, z=11, a=2. The first ball milling performed on the Mg, Mo, Al, Ni, and Ti powders after weighing is as follows: the milling atmosphere is argon atmosphere, the ball milling speed is 1600 r/min, the ball milling time is 15 h, the ratio of ball to material is 8.5:1, in the ball milling process, each ball milling lasts 65 min, and suspend the ball milling for 4.5 min, the temperature in the ball milling tank is controlled to be lower than 600° C. during the ball milling process. The vacuum melting performed on the first mixed powder is as follows: the vacuum degree is less than 0.01 Pa, the smelting time is 90 min, and the alloy ingots are flipped once every 220 s during the smelting process. The surface modification performed on the mentioned carbon nano tubes and graphene powders is as follows: prepare the silane coupling agent organic solvent, wherein the weight percentage of silane coupling agent is 2.5 wt %; place the carbon nano tubes and graphene powders into the organic solution of the silane coupling agent, and stir, the stirring time is 60 min, and the stirring temperature is 75° C. The second ball milling is as follows: the ball milling atmosphere is argon atmosphere, the ball milling speed is 550 r/min, the ball milling time is 6 h, the ratio of ball to material is 4.5:1, in the ball milling process, each ball milling lasts 35 min, and suspend the ball milling for 4.5 min, the temperature in the ball milling tank is controlled to be lower than 300° C. during the ball milling process. In the second mixture powder, Mg-based alloy ingots account for 110 parts by weight after being crushed, surface modified carbon nano tubes account for 15 parts, and surface modified graphene powders account for 4 parts. The first heat treatment performed on the second mixed powder is as follows: the heat treatment atmosphere is hydrogen atmosphere, the heat treatment temperature is 620° C., the heat treatment time is 15 min, and the heating rate is 15° C./min. The second hot pressed sintering performed on the third mixed powder is as follows: the hot pressing pressure is lower than 0.03 Pa, the hot pressing temperature is 730° C., the hot pressing pressure is 8 MPa, and the hot pressing time is 8 min.

Implementation Example 4

The green metal composite material is prepared by the following method: provide Mg, Mo, Al, Ni, and Ti powders; weigh the Mg, Mo, Al, Ni, and Ti powders according to a predetermined chemical formula; and perform the first ball milling on the Mg, Mo, Al, Ni, and Ti powders after weighing to obtain a first mixed powder; perform vacuum melting on the first mixed powder to obtain a Mg-based alloy ingots; crush the Mg-based alloy ingots; provide carbon nano tubes and graphene powders; and perform surface modification on the carbon nano tubes and graphene powders; mix well the crushed Mg-based alloy ingots and the surface modified carbon nano tubes and the graphene powders, and perform a second ball milling on the mixture to obtain a second mixed powder; then perform a first heat treatment on the second mixed powder to obtain a third mixed powder; then perform a second hot pressed sintering on the third mixed powder. In this process, the predetermined chemical formula is Mg100-x-y-z-aMoxAlyNizTia, wherein, x=2, y=1, z=5, a=0. The first ball milling performed on the Mg, Mo, Al, Ni, and Ti powders after weighing is as follows: the milling atmosphere is argon atmosphere, the ball milling speed is 2000 r/min, the ball milling time is 25 h, the ratio of ball to material is 10:1, in the ball milling process, each ball milling lasts 80 min, and suspend the ball milling for 10 min, the temperature in the ball milling tank is controlled to be lower than 600° C. during the ball milling process. The vacuum melting performed on the first mixed powder is as follows: the vacuum degree is less than 0.01 Pa, the smelting time is 90 min, and the alloy ingots are flipped once every 220 s during the smelting process. The surface modification performed on the mentioned carbon nano tubes and graphene powders is as follows: prepare the silane coupling agent organic solvent, wherein the weight percentage of silane coupling agent is 2.5 wt %; place the carbon nano tubes and graphene powders into the organic solution of the silane coupling agent, and stir, the stirring time is 60 min, and the stirring temperature is 75° C. The second ball milling is as follows: the ball milling atmosphere is argon atmosphere, the ball milling speed is 550 r/min, the ball milling time is 6 h, the ratio of ball to material is 4.5:1, in the ball milling process, each ball milling lasts 35 min, and suspend the ball milling for 4.5 min, the temperature in the ball milling tank is controlled to be lower than 300° C. during the ball milling process. In the second mixture powder, Mg-based alloy ingots account for 110 parts by weight after being crushed, surface modified carbon nano tubes account for 15 parts, and surface modified graphene powders account for 4 parts. The first heat treatment performed on the second mixed powder is as follows: the heat treatment atmosphere is hydrogen atmosphere, the heat treatment temperature is 620° C., the heat treatment time is 15 min, and the heating rate is 15° C./min. The second hot pressed sintering performed on the third mixed powder is as follows: the hot pressing pressure is lower than 0.03 Pa, the hot pressing temperature is 730° C., the hot pressing pressure is 8 MPa, and the hot pressing time is 8 min.

Implementation Example 5

The green metal composite material is prepared by the following method: provide Mg, Mo, Al, Ni, and Ti powders; weigh the Mg, Mo, Al, Ni, and Ti powders according to a predetermined chemical formula; and perform the first ball milling on the Mg, Mo, Al, Ni, and Ti powders after weighing to obtain a first mixed powder; perform vacuum melting on the first mixed powder to obtain a Mg-based alloy ingots; crush the Mg-based alloy ingots; provide carbon nano tubes and graphene powders; and perform surface modification on the carbon nano tubes and graphene powders; mix well the crushed Mg-based alloy ingots and the surface modified carbon nano tubes and the graphene powders, and perform a second ball milling on the mixture to obtain a second mixed powder; then perform a first heat treatment on the second mixed powder to obtain a third mixed powder; then perform a second hot pressed sintering on the third mixed powder. In this process, the predetermined chemical formula is Mg100-x-y-z-aMoxAlyNizTia, wherein, x=1, y=2.5, z=11, a=2. The first ball milling performed on the Mg, Mo, Al, Ni, and Ti powders after weighing is as follows: the milling atmosphere is argon atmosphere, the ball milling speed is 1600 r/min, the ball milling time is 15 h, the ratio of ball to material is 8.5:1, in the ball milling process, each ball milling lasts 65 min, and suspend the ball milling for 4.5 min, the temperature in the ball milling tank is controlled to be lower than 600° C. during the ball milling process. The vacuum melting performed on the first mixed powder is as follows: the vacuum degree is less than 0.01 Pa, the smelting time is 200 min, and the alloy ingots are flipped once every 500 s during the smelting process. The surface modification performed on the mentioned carbon nano tubes and graphene powders is as follows: prepare the silane coupling agent organic solvent, wherein the weight percentage of silane coupling agent is 5 wt %; place the carbon nano tubes and graphene powders into the organic solution of the silane coupling agent, and stir, the stirring time is 10 min, and the stirring temperature is 20° C. The second ball milling is as follows: the ball milling atmosphere is argon atmosphere, the ball milling speed is 700 r/min, the ball milling time is 10 h, the ratio of ball to material is 8:1, in the ball milling process, each ball milling lasts 50 min, and suspend the ball milling for 8 min, the temperature in the ball milling tank is controlled to be lower than 300° C. during the ball milling process. In the second mixture powder, Mg-based alloy ingots account for 110 parts by weight after being crushed, surface modified carbon nano tubes account for 15 parts, and surface modified graphene powders account for 4 parts. The first heat treatment performed on the second mixed powder is as follows: the heat treatment atmosphere is hydrogen atmosphere, the heat treatment temperature is 620° C., the heat treatment time is 15 min, and the heating rate is 15° C./min. The second hot pressed sintering performed on the third mixed powder is as follows: the hot pressing pressure is lower than 0.03 Pa, the hot pressing temperature is 730° C., the hot pressing pressure is 8 MPa, and the hot pressing time is 8 min.

Implementation Example 6

The green metal composite material is prepared by the following method: provide Mg, Mo, Al, Ni, and Ti powders; weigh the Mg, Mo, Al, Ni, and Ti powders according to a predetermined chemical formula; and perform the first ball milling on the Mg, Mo, Al, Ni, and Ti powders after weighing to obtain a first mixed powder; perform vacuum melting on the first mixed powder to obtain a Mg-based alloy ingots; crush the Mg-based alloy ingots; provide carbon nano tubes and graphene powders; and perform surface modification on the carbon nano tubes and graphene powders; mix well the crushed Mg-based alloy ingots and the surface modified carbon nano tubes and the graphene powders, and perform a second ball milling on the mixture to obtain a second mixed powder; then perform a first heat treatment on the second mixed powder to obtain a third mixed powder; then perform a second hot pressed sintering on the third mixed powder. In this process, the predetermined chemical formula is Mg100-x-y-z-aMoxAlyNizTia, wherein, x=1, y=2.5, z=11, a=2. The first ball milling performed on the Mg, Mo, Al, Ni, and Ti powders after weighing is as follows: the milling atmosphere is argon atmosphere, the ball milling speed is 1600 r/min, the ball milling time is 15 h, the ratio of ball to material is 8.5:1, in the ball milling process, each ball milling lasts 65 min, and suspend the ball milling for 4.5 min, the temperature in the ball milling tank is controlled to be lower than 600° C. during the ball milling process. The vacuum melting performed on the first mixed powder is as follows: the vacuum degree is less than 0.01 Pa, the smelting time is 90 min, and the alloy ingots are flipped once every 220 s during the smelting process. The surface modification performed on the mentioned carbon nano tubes and graphene powders is as follows: prepare the silane coupling agent organic solvent, wherein the weight percentage of silane coupling agent is 2.5 wt %; place the carbon nano tubes and graphene powders into the organic solution of the silane coupling agent, and stir, the stirring time is 60 min, and the stirring temperature is 75° C. The second ball milling is as follows: the ball milling atmosphere is argon atmosphere, the ball milling speed is 550 r/min, the ball milling time is 6 h, the ratio of ball to material is 4.5:1, in the ball milling process, each ball milling lasts 35 min, and suspend the ball milling for 4.5 min, the temperature in the ball milling tank is controlled to be lower than 300° C. during the ball milling process. In the second mixture powder, Mg-based alloy ingots account for 150 parts by weight after being crushed, surface modified carbon nano tubes account for 5 parts, and surface modified graphene powders account for 1 parts. The first heat treatment performed on the second mixed powder is as follows: the heat treatment atmosphere is hydrogen atmosphere, the heat treatment temperature is 620° C., the heat treatment time is 15 min, and the heating rate is 15° C./min. The second hot pressed sintering performed on the third mixed powder is as follows: the hot pressing pressure is lower than 0.03 Pa, the hot pressing temperature is 730° C., the hot pressing pressure is 8 MPa, and the hot pressing time is 8 min.

Implementation Example 7

The green metal composite material is prepared by the following method: provide Mg, Mo, Al, Ni, and Ti powders; weigh the Mg, Mo, Al, Ni, and Ti powders according to a predetermined chemical formula; and perform the first ball milling on the Mg, Mo, Al, Ni, and Ti powders after weighing to obtain a first mixed powder; perform vacuum melting on the first mixed powder to obtain a Mg-based alloy ingots; crush the Mg-based alloy ingots; provide carbon nano tubes and graphene powders; and perform surface modification on the carbon nano tubes and graphene powders; mix well the crushed Mg-based alloy ingots and the surface modified carbon nano tubes and the graphene powders, and perform a second ball milling on the mixture to obtain a second mixed powder; then perform a first heat treatment on the second mixed powder to obtain a third mixed powder; then perform a second hot pressed sintering on the third mixed powder. In this process, the predetermined chemical formula is Mg100-x-y-z-aMoxAlyNizTia, wherein, x=1, y=2.5, z=11, a=2. The first ball milling performed on the Mg, Mo, Al, Ni, and Ti powders after weighing is as follows: the milling atmosphere is argon atmosphere, the ball milling speed is 1600 r/min, the ball milling time is 15 h, the ratio of ball to material is 8.5:1, in the ball milling process, each ball milling lasts 65 min, and suspend the ball milling for 4.5 min, the temperature in the ball milling tank is controlled to be lower than 600° C. during the ball milling process. The vacuum melting performed on the first mixed powder is as follows: the vacuum degree is less than 0.01 Pa, the smelting time is 90 min, and the alloy ingots are flipped once every 220 s during the smelting process. The surface modification performed on the mentioned carbon nano tubes and graphene powders is as follows: prepare the silane coupling agent organic solvent, wherein the weight percentage of silane coupling agent is 2.5 wt %; place the carbon nano tubes and graphene powders into the organic solution of the silane coupling agent, and stir, the stirring time is 60 min, and the stirring temperature is 75° C. The second ball milling is as follows: the ball milling atmosphere is argon atmosphere, the ball milling speed is 550 r/min, the ball milling time is 6 h, the ratio of ball to material is 4.5:1, in the ball milling process, each ball milling lasts 35 min, and suspend the ball milling for 4.5 min, the temperature in the ball milling tank is controlled to be lower than 300° C. during the ball milling process. In the second mixture powder, Mg-based alloy ingots account for 110 parts by weight after being crushed, surface modified carbon nano tubes account for 15 parts, and surface modified graphene powders account for 4 parts. The first heat treatment performed on the second mixed powder is as follows: the heat treatment atmosphere is hydrogen atmosphere, the heat treatment temperature is 700° C., the heat treatment time is 25 min, and the heating rate is 30° C./min. The second hot pressed sintering performed on the third mixed powder is as follows: the hot pressing pressure is lower than 0.03 Pa, the hot pressing temperature is 820° C., the hot pressing pressure is 20 MPa, and the hot pressing time is 4 min.

Implementation examples 1-7 were subjected to a hydrogen absorption mass percentage test and a 30 minute hydrogen absorption mass percentage test, and the test method is well known in this field. The test results were normalized based on Example 1, and the test results are shown in Table 1.

TABLE 1 hydrogen 30 min hydrogen absorption absorption mass percentage mass percentage Implementation example 1 100%  100%  Implementation example 2 102%  101%  Implementation example 3 102%  104%  Implementation example 4 73% 59% Implementation example 5 69% 55% Implementation example 6 72% 51% Implementation example 7 73% 41%

The foregoing description of specific exemplary embodiments of the invention is for the purpose of illustration and exemplification, and these descriptions are not intended to limit the invention to the exact form disclosed, moreover, it is clear that many changes can be made according to the above teachings. The description of these selected exemplary embodiments is to explain the specific principles of the invention and its practical application, so that technicians in this field can utilize various exemplary embodiments of the invention with various choices and changes. The scope of the invention is intended to be limited by claims and their equivalents. 

1. A green metal composite material, characterized in that: the green metal composite material mentioned in this patent is prepared by the following method: Provide Mg, Mo, Al, Ni, and Ti powders; Weigh the Mg, Mo, Al, Ni, and Ti powders according to a predetermined chemical formula; Perform a first ball milling on the Mg, Mo, Al, Ni, and Ti powders after weighing to obtain a first mixed powder, Perform vacuum melting on the first mixed powder to obtain a Mg-based alloy ingots; Crush the Mg-based alloy ingots; Provide carbon nano tubes and graphene powders; Perform surface modification on the mentioned carbon nano tubes and graphene powders; Mix well the crushed Mg-based alloy ingots and the surface modified carbon nano tubes and the graphene powders, and perform a second ball milling on the mixture to obtain a second mixed powder; Perform a first heat treatment on the second mixed powder to obtain a third mixed powder; Perform a second hot pressed sintering on the third mixed powder.
 2. The green metal composite material mentioned in claim 1, characterized in that: the predetermined chemical formula mentioned in claim 1 is Mg100-x-y-z-aMoxAlyNizTia, wherein x=0.5-1.5, y=2-3, z=10-12, a=1-3.
 3. The green metal composite material mentioned in claim 1, characterized in that: perform a first ball milling on the Mg, Mo, Al, Ni, and Ti powders after weighing, and the specific methods are as follows: the ball milling atmosphere is argon atmosphere, the ball milling speed is 1500-1800 r/min, the ball milling time is 10-20 h, the ratio of ball to material is 8:1-9:1, in the ball milling process, each ball milling lasts 60-70 min, and suspend the ball milling for 4-5 min, the temperature in the ball milling tank is controlled to be lower than 600° C. during the ball milling process.
 4. The green metal composite material mentioned in claim 1, characterized in that: specifically, the vacuum melting performed on the first mixed powder is as follows: the vacuum degree is less than 0.01 Pa, the smelting time is 80-100 min, and the alloy ingots are flipped once every 200-250 s during the smelting process.
 5. The green metal composite material mentioned in claim 1, characterized in that: specifically, the surface modification performed on the mentioned carbon nano tubes and graphene powders is as follows: prepare the silane coupling agent organic solvent, wherein the weight percentage of silane coupling agent is 2-3 wt %; place the carbon nano tubes and graphene powders into the organic solution of the silane coupling agent, and stir, the stirring time is 50-70 min, and the stirring temperature is 70-80° C.
 6. The green metal composite material mentioned in claim 1, characterized in that: specifically, the second ball milling is as follows: the ball milling atmosphere is argon atmosphere, the ball milling speed is 500-600 r/min, the ball milling time is 5-8 h, the ratio of ball to material is 4:1-5:1, in the ball milling process, each ball milling lasts 30-40 min, and suspend the ball milling for 4-5 min, the temperature in the ball milling tank is controlled to be lower than 300° C. during the ball milling process.
 7. The green metal composite material mentioned in claim 1, characterized in that: in the second mixture powder, Mg-based alloy ingots account for 100-120 parts by weight after being crushed, surface modified carbon nano tubes account for 10-20 parts, and surface modified graphene powders account for 3-5 parts.
 8. The green metal composite material mentioned in claim 1, characterized in that: the first heat treatment performed on the second mixed powder is as follows: the heat treatment atmosphere is hydrogen atmosphere, the heat treatment temperature is 600-650° C., the heat treatment time is 10-20 min, and the heating rate is 10-20° C./min.
 9. The green metal composite material mentioned in claim 1, characterized in that: a second hot pressed sintering performed on the third mixed powder is as follows: the hot pressing pressure is lower than 0.03 Pa, the hot pressing temperature is 700-780° C., the hot pressing pressure is 5-10 MPa, and the hot pressing time is 5-10 min. 